x8u42．whistle vi.吹口哨；发出汽笛声n.口哨声；汽笛声3．hesitate vi.犹豫；踌躇→hesitation n．犹豫；踌躇6．classify vt.编排；分类；归类→classification n．分类；归类8．condemn vt.谴责；使……注定13．rob vt.抢劫；盗窃；剥夺→robbery n．抢劫行为19．overlook vt.俯视；忽视；不理会20．fade vi. & vt.使褪色；减弱；逐渐消失1．hesitate vi. 犹豫；踌躇hesitant adj. 犹豫的；踌躇的；迟疑的hesitation n. 踌躇，犹豫hesitate to do sth. 迟疑做某事hesitate about/at/in/over doing sth. 做某事犹豫不决without hesitation 毫不犹豫地即学即练11don’t ___________________ that. do it at once.
